IT Week has a hands-on look at Flickr, which uses user-defined tags to organize, display, and search for images. The author discusses the overall architecture of the site, the benefits of both free and premium accounts, and the Flickr applicaiton programming interface.
If you haven't started displaying your digital photos online, and may want to do so, this article is a good place to start. Especially if you'd like a peek behind the scenes.
